ajax传输xml数据：只要把数据封装成xml格式就可以实现传输，前台js用responseXML接收xml参数，后台读取用流和dom4j来解析
前台页面
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>Ajax XML数据处理演示</title>
<script type="text/javascript">
//get方式ajax
function send1(){
alert("ok");
var name=document.getElementsByName("name")[0].value;
var age=document.getElementsByName("age")[0].value;
var xhr=null;
if(window.XMLHttpRequest){
xhr=new XMLHttpRequest();
}else{
xhr=new ActiveXObject("Microsoft.XMLHttp");
}
var url="<c:url value='/XmlServlet?name='/>"+name+"&age="+age;
//3设置访问方式
xhr.open("GET", url, true);
//4设置访问成功返回后的操作
xhr.onreadystatechange=function(){
if(xhr.readyState==4){//返回
if(xhr.status==200){//响应代码正常
var txt=xhr.responseText;
alert(txt);
}
}
};
xhr.send(null);
}
</script>
<!-- 前台以xml的格式向服务器发送数据 -->
<script type="text/javascript">
//post方式ajax
function send2(){
alert("222");
//1创建ajax对象
var xhr = null;
if(window.XMLHttpRequest){//高版本
xhr = new XMLHttpRequest();
}else{//低版本
xhr = new ActiveXObject("Microsoft.XMLHttp");
}
//2请求地址
var url = "<c:url value='/XmlServlet'/>";
//3设置访问方式
xhr.open("POST", url, true);
//4设置访问成功返回后的操作
xhr.onreadystatechange=function(){
if(xhr.readyState==4){//返回
if(xhr.status==200){//响应代码正常
var xmlObj=xhr.responseXML;
var users=xmlObj.getElementsByTagName("user");
for(var i=0;i<users.length;i++){
var id=users[i].getAttribute("id");
var name=users[i].childNodes[0].firstChild.data;//xml中的dom模型中的操作方法，和html中有点小差别
var age=users[i].childNodes[1].firstChild.data;//不能用childNodes["age"]
alert(id+","+name+","+age);
}
}
}
};
var name=document.getElementsByName("name")[0].value;
var age=document.getElementsByName("age")[0].value;
var xml="<user><name>"+name+"</name><age>"+age+"</age></user>";
xhr.send(xml);
}
</script>
</head>
<body>
Name:
<input type="text" name="name">
<br /> Age:
<input type="text" name="age">
<br />
<input type="button" value="Get提交" onclick="send1();" />
<br />
<input type="button" value="Post提交" onclick="send2()" />
<br />
</body>
</html>后台页面
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>Ajax XML数据处理演示</title>
<script type="text/javascript">
//get方式ajax
function send1(){
alert("ok");
var name=document.getElementsByName("name")[0].value;
var age=document.getElementsByName("age")[0].value;
var xhr=null;
if(window.XMLHttpRequest){
xhr=new XMLHttpRequest();
}else{
xhr=new ActiveXObject("Microsoft.XMLHttp");
}
var url="<c:url value='/XmlServlet?name='/>"+name+"&age="+age;
//3设置访问方式
xhr.open("GET", url, true);
//4设置访问成功返回后的操作
xhr.onreadystatechange=function(){
if(xhr.readyState==4){//返回
if(xhr.status==200){//响应代码正常
var txt=xhr.responseText;
alert(txt);
}
}
};
xhr.send(null);
}
</script>
<!-- 前台以xml的格式向服务器发送数据 -->
<script type="text/javascript">
//post方式ajax
function send2(){
alert("222");
//1创建ajax对象
var xhr = null;
if(window.XMLHttpRequest){//高版本
xhr = new XMLHttpRequest();
}else{//低版本
xhr = new ActiveXObject("Microsoft.XMLHttp");
}
//2请求地址
var url = "<c:url value='/XmlServlet'/>";
//3设置访问方式
xhr.open("POST", url, true);
//4设置访问成功返回后的操作
xhr.onreadystatechange=function(){
if(xhr.readyState==4){//返回
if(xhr.status==200){//响应代码正常
var xmlObj=xhr.responseXML;
var users=xmlObj.getElementsByTagName("user");
for(var i=0;i<users.length;i++){
var id=users[i].getAttribute("id");
var name=users[i].childNodes[0].firstChild.data;//xml中的dom模型中的操作方法，和html中有点小差别
var age=users[i].childNodes[1].firstChild.data;//不能用childNodes["age"]
alert(id+","+name+","+age);
}
}
}
};
var name=document.getElementsByName("name")[0].value;
var age=document.getElementsByName("age")[0].value;
var xml="<user><name>"+name+"</name><age>"+age+"</age></user>";
xhr.send(xml);
}
</script>
</head>
<body>
Name:
<input type="text" name="name">
<br /> Age:
<input type="text" name="age">
<br />
<input type="button" value="Get提交" onclick="send1();" />
<br />
<input type="button" value="Post提交" onclick="send2()" />
<br />
</body>
</html>--------------------------------------------------------------------------------
Ajax传输Json数据的要点利用Apache或者阿里巴巴的JSONArray类进行传输
前台代码
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>Ajax Json数据处理演示</title>
<script type="text/javascript">
function ask1() {
//1创建ajax对象
var xhr = null;
if (window.XMLHttpRequest) {//高版本
xhr = new XMLHttpRequest();
} else {//低版本
xhr = new ActiveXObject("Microsoft.XMLHttp");
}
//2请求地址
var url = "<c:url value='/JsonServlet1'/>";
//3设置访问方式
xhr.open("POST", url, true);
//4设置访问成功返回后的操作
xhr.onreadystatechange = function() {
if (xhr.readyState == 4) {//返回
if (xhr.status == 200) {//响应代码正常
//※※※※※解析后台返回的json串
//js中eval()方法的功能：是校验参数文本串符合js中哪一种数据类型，并把其转换成对应类型的对象
var txt = xhr.responseText;
var users = eval("(" + txt + ")"); //把符合json格式的文本串 转换成 json对象
for ( var i = 0; i < users.length; i++) {
alert(users[i].id + "," + users[i].name + ","
+ users[i].age);
}
}
}
};
//5 发送
xhr.send(null);
}
function ask2() {
//1创建ajax对象
var xhr = null;
if (window.XMLHttpRequest) {//高版本
xhr = new XMLHttpRequest();
} else {//低版本
xhr = new ActiveXObject("Microsoft.XMLHttp");
}
//2请求地址
var url = "<c:url value='/JsonServlet2'/>";
//3设置访问方式
xhr.open("POST", url, true);
//4设置访问成功返回后的操作
xhr.onreadystatechange = function() {
if (xhr.readyState == 4) {//返回
if (xhr.status == 200) {//响应代码正常
//※※※※※解析后台返回的json串
//js中eval()方法的功能：是校验参数文本串符合js中哪一种数据类型，并把其转换成对应类型的对象
var txt = xhr.responseText;
//alert(txt);
//把符合json格式的文本串 转换成 json对象
var users = eval("(" + txt + ")");
for ( var key in users)//map的便利方式
alert("属性：" + key + ",值：" + users[key]);
}
//for ( var i = 0; i < users.length; i++) {//list的遍历方式
//alert(users[i].id +","+users[i].name+","+users[i].age);
//}
};
};
//5 发送
xhr.send(null);
}
function ask3() {
//1创建ajax对象
var xhr = null;
if (window.XMLHttpRequest) {//高版本
xhr = new XMLHttpRequest();
} else {//低版本
xhr = new ActiveXObject("Microsoft.XMLHttp");
}
//2请求地址
var url = "<c:url value='/JsonServlet2'/>";
//3设置访问方式
xhr.open("POST", url, true);
//4设置访问成功返回后的操作
xhr.onreadystatechange = function() {
if (xhr.readyState == 4) {//返回
if (xhr.status == 200) {//响应代码正常
//※※※※※解析后台返回的json串
//js中eval()方法的功能：是校验参数文本串符合js中哪一种数据类型，并把其转换成对应类型的对象
var txt = xhr.responseText;
//alert(txt);
//把符合json格式的文本串 转换成 json对象
var users = eval("(" + txt + ")");
for ( var key in users)//map的便利方式
alert("属性：" + key + ",值：" + users[key]);
}
//for ( var i = 0; i < users.length; i++) {//list的遍历方式
//alert(users[i].id +","+users[i].name+","+users[i].age);
//}
};
};
//5 发送
xhr.send(null);
}
</script>
</head>
<body>
<input type="button" onclick="ask1();" value="ajax请求后台数据(手动封装json方式)" />
<br />
<input type="button" onclick="ask2();"
value="ajax请求后台数据(用apache工具封装json方式)" />
<input type="button" onclick="ask3()" value="ajax请求后台数据(用fastjson工具封装json方式)" />
</body>
</html>JsonServlet1.java
package cn.hncu.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import cn.hncu.domain.User;
public class JsonServlet1 extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doPost(request, response);
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
//调用后台service.dao.query()，到数据库当中把信息读取出来
//为简化知识点的理解，此处后台部分的功能直接模拟
response.setContentType("text/html;charset=utf-8");
PrintWriter out = response.getWriter();
List<User> users = new ArrayList<User>();
users.add(new User("A001","Jack",20));
users.add(new User("A002","Rose",22));
users.add(new User("B001","张三",20));
users.add(new User("B002","李四",30));
String json="";
//用java封装出json格式的字符串：[{name:"Jack",age:25}, {...}, {...} ]
for(User u:users){
if(json.equals("")){
json="{name:""+u.getName()+"",id:""+u.getId()+"",age:"+u.getAge()+"}";
}else{
json = json +",{ name:""+u.getName()+"",id:""+u.getId()+"",age:"+u.getAge()+"}" ;
}
}
json="["+json+"]";
out.print(json);
}
}JsonServlet2.java
package cn.hncu.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import cn.hncu.domain.User;
import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
public class JsonServlet2 extends HttpServlet {
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=utf-8");
PrintWriter out = response.getWriter();
List<User> users = new ArrayList<User>();
users.add(new User("A001","Jack",20));
users.add(new User("A002","Rose",22));
users.add(new User("B001","张三",20));
users.add(new User("B002","李四",30));
String strJson=com.alibaba.fastjson.JSONArray.toJSONString(users);
System.out.println(strJson);
//用fastjson工具(只有一个jar包)帮我们把list转换成json串
Map<String, Object> map = new HashMap<String, Object>();
map.put("addr", "湖南");
map.put("height", "170");
map.put("marry", "no");
map.put("user", new User("A003","小李",25));
String strMap=com.alibaba.fastjson.JSONArray.toJSONString(map);
out.print(strMap.toString());
}
}JsonServlet3.java
package cn.hncu.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
import cn.hncu.domain.User;
public class JsonServlet3 extends HttpServlet {
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=utf-8");
PrintWriter out = response.getWriter();
List<User> users = new ArrayList<User>();
users.add(new User("A001","Jack",20));
users.add(new User("A002","Rose",22));
users.add(new User("B001","张三",20));
users.add(new User("B002","李四",30));
//用fastjson工具(只有一个jar包)帮我们把list转换成json串
JSONArray json=JSONArray.fromObject(users);
String strJson=json.toString();
System.out.println(strJson);
Map<String, Object> map = new HashMap<String, Object>();
map.put("addr", "湖南");
map.put("height", "170");
map.put("marry", "no");
map.put("user", new User("A003","小李",25));
JSONObject obj = JSONObject.fromObject(map);
System.out.println(obj.toString());
out.print(obj.toString());
}
}下载本文